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Shedding Light on the Crystallographic Etching of Multi-Layer Graphene at the Atomic Scale

Nano Research 2009年第9期2卷 695-705页

作者： Franziska Schäffel Jamie H.Warner Alicja Bachmatiuk bernd rellinghaus bernd Büchner Ludwig Schultz Mark H.Rümmeli IFW Dresden P.O.Box 270116D-01171 DresdenGermany Department of Materials University of OxfordParks Rd.Oxford OX13PHUnited Kingdom

The controlled etching of graphite and graphene by catalytic hydrogenation is potentially a key engineering route for the fabrication of graphene nanoribbons with atomic *** hydrogenation mechanism,though,remains poorly *** this study we exploit the benefi ts of aberration-corrected high-resolution transmission electron microscopy to gain insight to the hydrogenation *** etch tracks are found to be commensurate with the graphite *** particles at the head of an etch channel are shown to be faceted and the angles between facets are multiples of 30°.Thus,the angles between facets are also commensurate with the graphite *** addition,the results of a post-annealing step suggest that all catalyst particles even if they are not involved in etching are actively forming methane during the hydrogenation ***,the data point against carbon dissolution being a key mechanism during the hydrogenation process.

关键词： Graphene graphene nanoribbons catalytic hydrogenation nanoparticles

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Selective and self-validating breath-level detection of hydrogen sulfide in humid air by gold nanoparticle-functionalized nanotube arrays

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Nano Research 2022年第3期15卷 2512-2521页

作者： Luis Antonio Panes-Ruiz Leif Riemenschneider Mohamad Moner Al Chawa Markus Löffler bernd rellinghaus Ronald Tetzlaff Viktor Bezugly Bergoi Ibarlucea Gianaurelio Cuniberti Institute for Materials Science Max Bergmann Center of BiomaterialsTechnische Universität DresdenDresden 01062Germany Institute of Circuits and Systems Technische Universität DresdenDresden 01062Germany Dresden Center for Nanoanalysis(DCN) Center for Advancing Electronics Dresden(cfaed)Technische Universität DresdenDresden 01062Germany Life Science Incubator Sachsen GmbH&Co.KG Dresden 01307Germany Center for Advancing Electronics Dresden(cfaed) Technische Universität DresdenDresden 01062Germany

We demonstrate the selective detection of hydrogen sulfide at breath concentration levels under humid airflow,using a self-validating 64-channel sensor array based on semiconducting single-walled carbon nanotubes(sc-SWCNTs).The reproducible sensor fabrication process is based on a multiplexed and controlled dielectrophoretic deposition of *** sensing area is functionalized with gold nanoparticles to address the detection at room temperature by exploiting the affinity between gold and sulfur atoms of the *** devices functionalized with an optimized distribution of nanoparticles show a sensitivity of 0.122%/part per billion(ppb)and a calculated limit of detection(LOD)of 3 *** the self-validation,our sensors show increased stability and higher response levels compared to some commercially available electrochemical *** cross-sensitivity to breath gases NH3 and NO is addressed demonstrating the high selectivity to ***,mathematical models of sensors’electrical characteristics and sensing responses are developed to enhance the differentiation capabilities of the platform to be used in breath analysis applications.

关键词： chemiresistive gas sensors semiconducting carbon nanotubes gold nanoparticles hydrogen sulfide detection chemiresistor mathematical model

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Thermoelectric properties of silicon and recycled silicon sawing waste

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Journal of Materiomics 2019年第1期5卷 15-33页

作者： Ran He Wieland Heyn Felix Thiel Nicolas Perez Christine Damm Darius Pohl bernd rellinghaus Christian Reimann Maximilian Beier Jochen Friedrich Hangtian Zhu Zhifeng Ren Kornelius Nielsch Gabi Schierning Leibniz-Institut für Festk€orper-und Werkstoffforschung Dresden 01069DresdenGermany Institute of Materials Science Technische Universit€at Dresden01069DresdenGermany Dresden Center for Nanoanalysis Technische Universit€at Dresden01062DresdenGermany Fraunhofer Institut für Integrierte Systeme und Bauelementetechnologie 91058ErlangenGermany Department of Physics and TcSUH University of HoustonHoustonTX77204USA

Large-scale-applicable thermoelectric materials should be both self-sustaining,in order to survive longterm duty cycles,and *** all classes of known thermoelectric materials,these criteria reduce the available candidate pool,leaving silicon as one of the remaining *** we first review the thermoelectric properties of various silicon-related materials with respect to their morphologies and *** then report the thermoelectric properties of silicon sawing wastes recycled from silicon wafer *** obtain a high power factor of~32 mWcm1 K2 at 1273 K with 6%phosphorus substitution in the Si crystal,a value comparable to that of phosphorus-doped silicongermanium *** work suggests the large-scale thermoelectric applicability of recycled silicon that would otherwise contribute to the millions of tons of industrial waste produced by the semiconductor industry.

关键词： Silicon Thermoelectric Nanostructure Power factor Sawing waste

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Single Cr atom catalytic growth of graphene

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Nano Research 2018年第5期11卷 2405-2411页

作者： Huy Q. Ta Uang Zhao Wanjian Yin Darius Pohl Bemd rellinghaus Thomas Gemming Barbara Trzebicka Justinas Palisaitis Gao Jing Per O. A. Persson Zhongfan Liu Alicja Bachmatiuk Mark H. Rummeli Soochow Institute for Energy and Materials Innovations College of Physics Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215005 China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 China Centre of Polymer and Carbon Materials Polish Academy of Sciences M. Curie-Sklodowskiej 34 Zabrze 41-819 Poland IFW Dresden Helmholtz Strasse 20 01069 Dresden Germany Department of Physics Chemistry and Biology (IFM) Linkoping University SE-581 83 Linkoping Sweden Center for Nanochemistry Beijing Science and Engineering Centre for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Single atoms are the ultimate minimum size limit for catalysts. Graphene, as an exciting, ultimately thin （one atom thick） material can be imaged in a transmission electron microscope with relatively few imaging artefacts. Here, we directly observe the behavior of single Cr atoms in graphene mono- and di-vacancies and, more importantly, at graphene edges. Similar studies at graphene edges with other elemental atoms, with the exception of Fe, show catalytic etching of graphene. Fe atoms have been shown to both etch and grow graphene. In contrast, Cr atoms are only observed to induce graphene growth. Complementary theoretical calculations illuminate the differences between Fe and Cr, and confirm single Cr atoms as superior catalysts for sp^2 carbon growth.

关键词： in situ transmission electron microscope (TEM) electron driven catalysis Cr single atom graphene synthesis

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